Near-field radio holography of large reflector antennas (710).

Content Provider	CiteSeerX
Author	Baars, J. W. M. Lucas, R. Mangum, J. G. Lopez-Perez, J. A.
Abstract	Abstract — We summarise the mathematical foundation of the holographic method of measuring the reflector profile of an antenna or radio telescope. In particular, we treat the case, where the signal source is located at a finite distance from the antenna under test, necessitating the inclusion of the so-called Fresnel field terms in the radiation integrals. We assume a “full phase” system with reference receiver to provide the reference phase. We describe in some detail the hardware and software implementation of the system used for the holographic measurement of the 12m ALMA prototype submillimeter antennas. We include a description of the practicalities of a measurement and surface setting. The results for both the VertexRSI and AEC (Alcatel-EIE-Consortium) prototype ALMA antennas are presented. Index Terms — ALMA, Antenna measurements, radio holography, millimeter antenna, near-field, radio telescope.
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Subject Keyword	Near-field Radio Holography Large Reflector Antenna Radio Telescope Holographic Measurement Software Implementation Mathematical Foundation Reference Phase Radio Holography Holographic Method Alma Prototype Submillimeter Antenna Finite Distance Signal Source Reflector Profile Millimeter Antenna So-called Fresnel Field Term Index Term Alma Surface Setting Full Phase System Antenna Measurement Radiation Integral Prototype Alma Antenna Reference Receiver
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